function winopen(okurl,openname,iWidth,iHeight){
	var iTop = (window.screen.height-30-iHeight)/2;
	var iLeft = (window.screen.width-10-iWidth)/2; 
	window.open(okurl, openname, 'height='+iHeight+', width='+iWidth+',top='+iTop+',left='+iLeft+',toolbar=no, menubar=no, scrollbars=yes, resizable=yes, location=no, status=no');
}